<div class="popper">
  <div class="popper-activator" #popperActivator>
    <ng-content select="[popper-activator]"></ng-content>
  </div>
  <div class="popper-container" #popperContainer [ngClass]="{'fluid': fluidPopper && !appendTo}">
    <ng-content select="[popper-prepend]"></ng-content>
    <div class="popper-container-scrollable devui-scrollbar">
      <ng-content select="[popper-container]"></ng-content>
    </div>
    <ng-content select="[popper-append]"></ng-content>
  </div>
</div>
